Grinding machine



'LLSIURTEVANT.

GRINDING. MACHINE.

APPLICATION HLED on. 22. 1921.

Patented Apr. 4, 1922.

2' snaps-sac 1.

' Inventor T. l. STURTEVANT.

GRINDING MACHINE.

APPLICATION FILED OCT. 22. I921 Patented Apr. 4, 1922.

2 SHEETS-SI IEET 2.

Inventor UNETED stares Mimi m THOMAS J. S'IURTEVANT, 0F WELLESLEY, MASSACHUSETTS, AssieN'On To swam VANT MILL COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION or MASSA- enUsETTs.

GRINDING Macrame To all whom it may concern: x v

Be it known that I; THOMAS J. STURTE- vaxr, a citizen of the United States, residing at lVellesley, in-theoounty of Norfolk and State of 'h iassachusetts, have invented an Improvement in' Grinding Machines, of

which the following description, in connection with the accompanying drawings is a specification, like characters on the drawings representing like parts. i a

' "The invention to .be hereinafter described relates to machines for-grinding or reducing surfaces of thecasing-offthe machine and the mechanism contained therein.

One of the purposes of the present inven tion, therefore, 1s t0 vprovidea-machine which is so constructed that convenient,- easyw'access maybe had. to the inner surfaces of the casing and themechanisni contained therein.

As' aconsequence, the dust may "be readily brushed therefrom" and collected' as a part of the sample reduced. Also,'-it' the machine is used to grind difierentmaterials, the parts may 'be' readily cleaned to 1 prevent -mi xing of dustfrom one samp e with dust of another sample otdifferent material. 4' Sometimes materi ls between the griml- 4mg members mayjproducegrooves in the surfaces thereof'or otherwise disfigure the same. f" j u i Another purpose of T the invention there- Fore, is toprovide means-to enablerelative adjustment or displacement of V the grin din g members so that on -further operation oi the grin dingmembersysuch-grooves orother disfignre nent may be removed. k 1 Sometimes abnormally large or hard materials may come' between the surfacesof the grinding members with sequent I 1n ury thereto.

liability of coin Another purpose of the invention; therefore, is to provide yieldingmeans'togenable,

one'of the grinding members to move away from the other grinding member, and there by prevent such injury to the members Still another purpose of theinvention is I Specification Of tamer; Patent. 'Application filed October 22, 1921.

transverse sectiolrtaken on line 3+3 of Fig.

Serial is, 509,495.

to provide a simple, eilicient machine for the purposes, which may be easily manufactured with economy of material.

ith the aforesaid and'oth'er purposes in view,"the-characterjof the invention may be best understood by reference to the following description of one good form thereof shown in' the accompanying drawings, wherein: I l Fig. 1 is a plan of the machine 5- in Fig. 2 is a vertical longitudinal section takeiron line 22 of Fig. 1

Fig. son an enlargedscale is avertical Fig. 4 i's'an' end elevation of themaclrine;

Fig, '5 13 srcle" elevationfof aportion of the machine showing therhamber of the casing in open position; and '1 1 Fig. 6 on an enlarged scale 'is a vertical The 'n acliine shown herein; as one good form of the.'1nvent1o1r, comprises a suitable v support,- 1n the present instance, in the form r of a-bas'efl (Figs. '1 sandQ) fhavingiholesfi adapted" to receive bolts for securing the same in posit on. ,Rislngfrom thebase are uprights and? "which may have bores 9 struction 7' In the present instanceofthe'invention,

roller.bearingsareprovided; eaQh C'Omp'ris' ing a series Ofrollers, ll formed o fheli j- ,cally wound ribbon material of resilient character: At opposed ends of the rollers are washers 13 'connectedatiifitervals by .rods lfi'locatedin spaces between-the rollers,

' The 'washers maybe jconfined by: inner rings 1.7 and outer rings-.19 which may be tightly j fitted or otherwise secured in the bores Th'ese bearingsniay belubricated byfsuite ble grease-cups 21.

a fast pulley 25 shaft intermediate the bearing; supports. The shaft 23 has an end" portion 29 projecting a substantial distance beyond the right hand bearing (Fig.2), and serves to support a grinding member 31, in the present instance,-comprising a disk 33' having a hubr35 secured by a key 37 on areduced end of the shaft portion'29. A ring 39 has'110 Patented Apr. 4,

transverse section] taken P on line 6 6 of adapted tof' receive bearings ofsuitable con- 85 a central aperture 41 adapted to fit on the hub 35, and said ring is detachably secured to the disk 33 by screw bolts 43. This ring may have asuitable grinding surface, in

the present instance, comprising radial ribs 45 tapering toward a smooth surface intermediate the ends of the ribs and the periphery of the ring. This grinding member is adapted to co-operate with an opposed fixed grinding member 47 provided with radial ribs49 tapering toward a smooth portion between the ends of the ribs and the periphery of the member.

The grinding members may be enclosed in a casing 51 which is constructed to enable ready access to the grinding members and the inner surfaces of the casing, in order that after material has been ground, any residual dust on said parts may be brushed therefrom.

The casing, in the present instance, comprises a fixed plate or member 53 which may be suitably supported. 7 To accomplish this, in the present instance, said plate is provided with an extension 55 bored to receive the shaft and terminating in 'a boss formed to fit in the bore 9 for the right hand hearing. This boss may also constitute the right hand ring 19 referredto, for one of'the roller bearings. 7 I To secure the casing late 53 to the upright 7 a pair of through bolts 57 (Fig. 1) may be entered through the plate and through the base upright? Preferably these through bolts are in the same plane with the axis of the shaft 23 and the boss or ring 19, thereby rigidly to secure the plate to the support and effectively resist rockingstrains of the casing plate on its support.

Suitable means may be provided to prevent dust from working along theshaft 23 from the casing to the right hand bearing. This means, in the present instance, is in theform of a chamber 59 (Fig.2) formed in the plate extension 55 about the shaft, and provided with an outlet 61. The con struction is such that any dust working from the casing along-the shaft through the bore in the casing plate, will enter the chamber 59 and be delivered therefrom through the outlet 61. Asa consequence, the dust cannot enter the right hand bearing and cause injury thereto. V

T he casing 51 may have a body 63 provided with a chamber 65 of sufiicient width to accommodate the grinding members. This chamber has an open side 67 which normally closed by the casing plate The body 63 may be connected tothe plate 53 by suitable hingexmeans, in the present instance, comprising a pair of lugs 59 projecting from the plate 53, and a pair of lugs 71 p1Oj80t1I1gfrom the body 63. These lugs have registering bores receiving a shaft 73 which may be secured to one of the lugs of the fixed plate 53 by aset screw 75 or other suitable securing means. The lower end of the shaft 73 may have a threaded portion 77 receiving an adjusting nut 7 9 and a lock nut 81, the former being adapted to engage the under side of the lower lug of the casing body 63. The construction is such that the body 63 may be adjusted relatively to. the fixed plate 53 and the grinding member carried by the shaft, for a purpose tobe described.

To hold the body closed position, it may have suitable securing means, in the present instance, comprising a" latch hav.

ing a yoke 82 (Fig. 1) fulcrumed on a'pin 82 carried by a lug 82 projecting from the casing body. This yoke is adapted to swing over a lug 83 projecting from the fixed plate, and be secured by a set screw 85.

The grinding member 47 referred to, may be detachably secured to the body of the casing by suitable means, in the present instance, in the form of screw bolts 87 (Figs. 1 and 2) desirably located in' a. horizontal plane cutting the axis of the shaft 23.

The grinding member 47 carried by the body may have-a central aperture 89 registering with thethroat 91 of a hopper 93 which may be formed on and carried by the casing body. Thejconstruction is such that materials introduced into the hopper 93 will pass through .thethroat 91 and the aperture 89 to the space between theop posed faces ofth'e grinding members for reduction thereby I I As stated, one of the purposes of the present machine is to grind or reduce samples of various materials for the purpose of laboratory analysis. Suitable means may be pro vided to receive a sample afterit has'been reduced. This means, n the present instance of theinventien, compr sesga drawer 95 adapted to slide in guides 97 at the bottom of the casing body, said drawer being prov ded wlth a su tablehandle 98. The con struction 1s such'thatthe materials reduced on relative rotation of the grinding meinbers, will be guided by the inner walls of the casing down into the drawer.

As stated, it is necessary that the com plete sample reduced shallbe retained. This makes it necessary to haveready access to the inner surfaces of the casing and the parts contained therein, in order that any residual dust thereon may be brushed therefr'cnn.

The construct-ion described lends itself ad vantageously to this purpose. After a sample has been ground, the latch set screw 85 may be released to permit the yoke 82 to be swung away from the plate lug -83. Thereupon, the casing body which carries the grinding member 4:7 and the hopper 93 and the drawer, may be swung on the hinge means away from the cas j plate53. As a consequence, the grinding member 15;? cartherefrom.

riecl by the casing, is swung away from the grinding member 31 carried by the shaft, as will be noted in Fig; 5, thereby exposingthe inner surfaces of the casing, thesurfaces'of. the grlndmg members, and-other parts conmoved, the casing body may beswung on its lungs to closed position, and the-latchjmay be secured. s

It is desirable-to be able. to adjust one of the grinding members relatively to the other to ary'thespace between them. To accoina plishfifihis, inthe present instance,- the lett end of the shaft 28 may be extended beyond the left hearing, into aheadll (Figs. 1 and 2 Threaded into-this head-is an adjusting screw 101 provided with a "hand wheel 103. A hand wheel lock nut 105 on .the adjusting the head to secure the-former in its diiterent positions. of. adjustment.-. Int'erposed be- 'Inembers, pressure will occur ten dingzto' thrust the shaft 23axially toward the left."

against-the thrustbutton; Since the thrust tween the inner'end of the adjusting screw "and the end of tllCSllilfil is athrustbutton 107 haying lugslOQ (Fin: 3) projecting therefrom into guideways 111 formed the head. The en 'a 'in faces ef'the end of the t D U shaft and the thrust button may be lubri- .cated' by means ofa grease cup 113.

buttonis confined againstrota'tion', it will prevent any tendency to rotatethe adjusting screw 101 suchfas might destroyits-proper. "adjustment. .011 release ot'- the handwheel nut 105, :theadjustingscrewn ayi be turned 'to adjust the shaft axially to yaiytheispace between the conditions asrequ-iredQ 'I r It is desirable to-provldemeans to allow yielding increment of {the shaft in an axial direction when abnormal niateri als' cofme between: the grinding members, in order to prevent injury thereto. To accomplish this, in

thepresent;instance, the head 99 referredtoi may be provided with a PEtHI'Of'COIl springs 115 (Figs. 1 and 3) mounted in sockets 117 formed iu'the. head These sprinnsmaybe confinedbetween the bottoms otthe'sockets jand washers 119Cmounted in thesockets and 'limited by adjusting nuts 121fheld by lock nuts 123, 'said nuts. being; threaded to through bolts entered through the sockets and through the base upright re 'ferred to.-

After the dust has been re-' grinding". members 'accordin to.

These coilsprings will react againstthe washers and nuts so as normally tohold the head against the outer face of the upright, but if abnormal materials come between the "grinning members, the shaft" will be thrust somewhat toward the left (Fig. 2) and through the thrust'button, adjusting screw and head will compress the coil springs and noye the" head away from the face. of the u1n1ght. As a result, injury to the faces of the grinding members from suchcause' is prevented;

In the course 0f" use the surfaces-of the.

opposed grinding member may become grooved or scored circumferentially thereof.

To remove suchdi'sfigurementfrom the surfaces the ad ustin nut 79 on the hinge body of the casing, thereby to move. the grinding member l-'7 carried by 'the body of thecasing to a position somewhat'eecenshaft may be adjustedtoraise or lower the trio to the grinding member carried by the shaft; As a consequence, on further.rota} tion of the grinding membercarried byflthe W i shaft, such disfigurement to the-surfaces 'screwis adapted to bear against theend' 01' may be ground off and removed.

. hen the machine. is employed asasaniple'grindenithe sample is-introducedinto 1 the hopper'93 andpasses theneedownward and laterally through "the-throat 91 and aperture 89 to the space between thegrinding. members, and the reduced salnpl eis col:

lected in the drawer 95; Thenthe body of v r the casing; may swung to openposit ion to enablethe-residual dust 'to be binshed from :the innersurfaces" oft-the CEISlIlQf-itIlCltll,

grinding mechanism therein'into the drawer.

Thus, the complete sample'is collectedizand ready forlaboratoryanalysis or other pur pose as required.

.S'nce the grindingmember carried by the I shaft is a substantial distance 'fro'm'the fixed -plate of the casing, the rear face" of: the) grinding member and the 'innensurface of 3 the fixed 'plate are accessiblelto enable" dust tobe'brushedtherefrom. Ifdesirech greater y accessibilityto the surfaces may 'be-fhad'by" ario grasping" thegrinding memberv carried' by the shaft and pulling the same iorwarduntil limited by engagement o-f the-"hub ofthe fixedpulley'withthe b'ase{upright 7f I lu -some cases it may be desirable to use the-machineas a continuousQrinded[To l'accomplishs-this, the drawer Qty-may. here- 3 :nioved, andther reduced materials imay be delivered intoaisuitableohute leading to an appropriate collecting receptacle.

n will be noted that the body of at cas ins is hineedto {the fixed plate on a vertical axis Th1s' enables-thebody and thehopper, 'riiidlngjmeniber and" drawer carried ris v by theibody. tobe easilyand'readily swung to open position, and without the-necessity forlifting-the body, a's would be necessary if it'werefhinged Qua-horizontal axis;

was

The construction is such that the parts contained within the casing may be quickly readily slide in the direction of its axis against the resistance ofthe spring-pressed head during the operation of the machine, without liability of scoring or grooving the shaft, and consequent interference with its free axial movement.

The machine described is simple in construction, cheap to manufacture and not liable to get out of order.

It will be understood is not limited to the specific embodiment shown, and that various deviations may be made therefrom without departing from the pirit and scope of the appended claims. V] hat is claimed is:

1. A machine of the character described,v comprising, in combination, a support provided with bearings, a casing having wall plate mounted on said support and a chamber hinged to said wall plate, a shaftjournalled in said bearings and projecting through said plate, and grinding members, one on said shaft and the other on said chamber, the latter having a depthsufiicient completely to receive both of said members when the hinged chamber is closed and separating and exposing said members when the hinged chamber is opened, thereby furnishing access to said members and the inner surfaces of said plateand chamber toenable ready removal of dust therefrom.

2. A machine ofthecharacter described, comprising, in combination, a support provided with cylindrical roller bearings, a shaft journalled in said roller bearings and having anyend POltion projecting a substantial distancebeyond one of said bearings, a casing having a wall fired to said supportadjacent one ofisaid bearings, and a chamber having an open side normally closed by said fixed wall, hinge means com I nect-ing said chamber and fixed wall, that the former may swing to open and closed positions, means to secure the chamber in closed position, grinding membersmounted in the chamber and on the end portion of said shaft respectively, and means including a spring enabling movement of said shaft parallel to the direction of the axes of the cylindrithat the invention cal roller bearings relatively to the latter to prevent injury to the grinding members on entrance of abnormally large materials between them.

3. A machine of the-character described, comprising, in combination, a support provided with bearings, a shaft journalled in said bearings, a casing comprising a fixed wall and a chamber hinged to the fixed wall,

the latter having an extension'secured to the her having an openside and a wall normally closing said open side, hinge means connect ing said side and chambenopposed grind ng members, one mounted on said shaft andthe other mounted on said chamber, said hinge means having provision for adjusting the chamber relatively to said side to enable ro-' tation of the shaft grinding member eccen-' trically to the chamber grinding member to remove grooves or scorings on the faces of the grinding members. 7

5. A. machine of the character described, comprising, in'combination, a support'provided with bearings,"a shaft journalled in said bearings, a casing comprising a chamber having an open side and a fixed wall, normally closing the open side, means to se cure the wall to said support, hinge means connecting said chamber and wall, grinding members respectively mounted on the chamher and shaft, a hopper on the'chamber for delivering materials-into the latter between the grinding members, and a drawer on the chamber for receiving the materials reduced '110' by the grinding members, said chamber, the grinding member thereon, the hopper and the drawer being movable with the chamber away from the fixed walland shaft grinding member when the chamber is swung on its hinge means into open position.

6. A machine of the character described, comprising in combination, a. support, a shaft mounted on said support, a casing comprising apart fixed on said support and a a hollowpart hinged to said first-named part on a substantially vertical axis, and-op posed grinding members, one secured on said shaft a substantial distance from the fixed part of said casing, and the other mounted sides of the grinding member on the shaft,

the face of the grinding member on the hinged part of the casing, and the lnner surface of the casing being exposed to enable removal of dust therefrom when the hinged part of the casing is swung on its hinge to open position.

7. A machine of the character described, comprising, in combination, a support, a shaft mounted on said support, a casing comprising apart fixed on said support and a part hinged to said fixed part, opposed grinding members, one mounted on the shaft and the other mounted on the hinged part of the casing, and means to adjust the grinding member on said hinged part of the casing to a position eccentric with respect to the axis of said shaft to enable rinding of grooves or other deformations from the faces of the grinding members on relative rota tion of the same.

8. A machine of the character described, comprising, in combination, a support having standards provided with aligned bores therein, bearings mounted insaid bores, a shaft journalled in said bearings and having an end portion projecting a substantial distance beyond one of them, a casing having a fixed part bored to receive the end portion of said shaft and having .a supporting boss mounted in the bore of one ofthe uprights,

said casing having a chamber hinged to said fixed part, means to secure the chamber in bers, one carried by said chamber and the 1 other carried by the end portion of said shaft for reducing materials introduced between them.

-9. A machineof the character described,

bore in the upright, a pair of bolts'in substantially the same plane {as the axis of said boss for securing the fixed part of the casing to said upright, and-grinding members enclosed by i sald casing, one being carried by said chamber and the other being carried by the end portion of said shaft. a v a I In testimony whereof, I have signed my name to this specification. 7

THOMAS J. STURTEVANT.

3O closed position, and opposed grinding mem- 

